*{
    margin: 0;
    padding: 0;
}
.clear::after {
    content: '';
    display: block;
    clear: both;
}
ul{
    list-style: none;
  }
  table{
      text-align: center;
  }
.nav{
    width: 100%;
    height: 30px;
    line-height: 30px;
    margin-top:40px ;
  
}
#nav>.myli{
  overflow: hidden;
  background-color: aqua;
}
.header>h4{
    font-weight: 600;
}

#mybtn {
    float: right;
    margin-right: 30px;
    margin-top: 10px;
    width: 80px;
    height: 30px;
  
    border-radius: 8px;
    border:none;
    color: #fff;
    background-color: #6554C0;

}
#thead{
    text-align: center;
    background-color: #F2F2F2;
}

#thead>tr>th{
    margin-left: 20px;
    text-align: center;
    border-bottom: 1px solid #fff;
}
#tbody>tr>td{
    border-top: 1px solid #fff;
}
.btn_xiangxia{
    color: #64C8BC;
    background-color: #EDF8F6;
    border: none;
    width: 30px;
    height: 20px;
}
.btn_tianjia{
    color: #FEA858;
    background-color: #FEF2E6;
    border: none;
    width: 30px;
    height: 20px;
}
.btn_shuxie{
    color: #5FA4E2;
    background-color: #EEF6FC;
    border: none;
    width: 30px;
    height: 20px;
}
.btn_shanchu {
    background-color: #FEF3F3;
    color: #FFC9D2;
    border: none;
    width: 30px;
    height: 20px;
}

.active {
    background-color: #61A4E4;
    color: #fff;
}